To begin the first year of my relationship was great with this girl - filled with blissfulness, happiness, and so much love. But in the second year, my exgirlfriend destroyed me to the very core. It was absolute annihilation. She used me for my adderall prescription, my time, my energy, and she demanded 100% of my attention while I was finishing two graduate degrees and working 25-30 hrs a week, while also preparing myself for interviews to get my career started and she insisted I attend to her every need, forcing me to drop everything I was doing at any time to attend to her - I really loved her and I didn't want her to break up with me. I know, I was so stupid for allowing myself to be treated like this, but I couldn't help the love I felt for her.

At the end of that year, she cheated on me with another guy and broke up with me. We were living together that second year, but she ended up signing a lease with that guy, somewhere else, weeks after cheating on me and stringing me along, and ended up getting into a relationship with and moving in with him. She doesnt have a job right now and is still in school which starts back up this August, and because of her stupid and selfish choices (the combination of having no income and having to pay rent for two places) , was not able to pay the DTE bill for our place (which was in her name) which left me without warm water for a whole week. I ended up paying that bill which was $200.

Shes lied to me about almost everything and has had me excited time and time again, welcoming her back to me after shes told me she was done with that guy and was coming back to me, only to use me some more (sex, cuddling, food, adderall, help with school work, etc) , only to go right back to him leaving me bled out to dry.

I've been devastated and on the threshold of suicide so many time and have so much anger right now - I saw my future with this girl for so long and was working so hard for her. I have so much evidence to bring her relationship down including her cheating on her new boyfriend with me several times, pictures, and many many texts that would bury her if he found out about them. I've had such a hard time moving on from her and I know that sending all this to him would be such a juvenile thing to do but at the same time shes literally not had to feel any consequences for what she done and it may even make me feel like I can finally let go and move on if I do this.

What's the consensus?

Thank you so much!

tl;dr lying, cheating, and using girlfriend destroyed me to the very core. Need to know if I am justified in crushing her new relationship with the dude she cheated on me with by sending texts and pictures of her cheating on him with me that would ruin her.